ABSTRACT
In order to study the influence of the sealing effect of steel box girder on the long-term performance of the steel-concrete composite beam bridge, this paper carries out a scale test of the steel-concrete composite bridge based on the actual project, and explores the temperature and humidity changes in different parts of concrete slab and the shrinkage of the upper and lower surfaces. The results show that the temperature and humidity in the deck are non-linear along the section. Among them, the temperature at 1/4 depth from the top surface of the concrete is the highest and the temperature at 1/2 and 3/4 depth from the top surface is similar; In the deck, the maximum humidity is 3/4 depth from the upper surface, followed by 1/4 and 1/2 depth from the upper surface and the humidity is similar; The shrinkage calculation model in EC2 code is selected to simulate the test. The results show that the shrinkage calculation model underestimates the shrinkage value of concrete. The prediction deviation is 37.7% in the early stage of concrete shrinkage development and 31.1% in the slow stage of concrete shrinkage development.
